The phrase "mic drop" means to confidently make a powerful statement or performance and then abruptly leave the stage, most commonly using a microphone as a prop. Full definition
Here are some of the best reactions to Nico's badass mic drop of a retirement. (wtf1.com)
The final mic drop included a November release date, which leads us to believe Fallout 4 had to have been pretty close to if not already finished development by the time they announced. (nonfictiongaming.com)
Seriously, after I do set of squats on the squat rack, I feel like I can saunter into any boardroom in corporate America, say nothing, and just mic drop. (lawsofbliss.com)